hammer - i would agree - that rebuilding sport engines is a waste of money. however, on high end race engines, the cost of the new engine is so high, that a rebuild is much more economical.

example - my RZ(VO1B)'s in the buggies are almost 300.00 new. a piston/sleeve/conrod is only 150.00 and i need to do it every year. so its much better for me. The RB Rody V12 i just purchased lists for 425.00, a new piston/sleeve/conrod is 210.00 - so again, a better deal.